There are 11 teams working under the supervision of two DCPs of Crime Branch to trace Najeeb, who had gone missing on October 15 following an on-campus scuffle allegedly with ABVP members the night before.
Delhi Police has raised the reward amount for providing information that could help locate Najeeb from Rs 5 lakh to Rs 10 lakh
The case was transferred to Crime Branch from South district police last month owing to the "sensitivity" of the case.
The Delhi High Court today directed the police to "scan" the entire campus, including hostels, classrooms and rooftops, of the varsity by using sniffer dogs.
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The four students, who are suspected of beating up Najeeb, are likely to put to lie-detector tests to get leads or clues about his disappearance and whereabouts.
The eleven teams of Delhi Police are working on various probabilities that include the chances of Najeeb going into self-concealment fearing a threat to his life and the possibility of someone close to him instigating him to go into hiding, said the officer.
The police is also working on the theory whether he was abducted by someone and the probabilities of him harming himself or falling prey to a mishap, he said.
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